[blub]

There are two things that are critically incorrect about your argument:

1) That market success implies having quality software. Average seems to be enough in my experience.

2) That start-ups are a good example to follow if one wants to achieve good quality. In fact they should be ignored, because they will absolutely murder quality in order to stay alive. Sometimes the product doesn't even work and is held together with duct tape in order to get past that important demo... It's quite pointless to discuss quality and start-ups.

The lesson I mentioned should be heeded by mature companies that are able to do some project planning, complexity estimation, etc.